John w



@anni @time JOHN W. MURPHY, OF PEILADELPHA, PENNSYLVANlA.

Letters Patent No. 113,685, dated April 11, 1871..r

HMPROVEMENT iN LUBRICATING PIVOTS FOR TURN-TABLES- The Schedule. referred to in these Letters Patent and making part of the same.

To alljwlwm it may conce-rn.:

Be it known that I, JOHN W. MURPHY, of the city of PhiladelphiaI and State of Pennsylvania, have invented certain new and useful Improvement-s in Lubricating Pivots or Steps for Turn-Tables for Itaiload and other purposes; and that the following isa full, clear, and exact description of the same, reference being had to the accompanying drawing'making a part of this specification, in which- Figure 1 represents a verticalsection through the pivot or step; and

Figure 2 .represents a top plan ot' one part of the pivot or step with its spiral groove in i'ull black lines, and the groove of the .other part, as well as the oilholderv and distrbuter in dotted lilies. l

Similar letters of reference where they occur in the separate figures denote like parts ofthe stop or pivot in the drawing.

My invention consists in forming in the two adjacent and contiguous surfaces of thest'ep or pivot 'spiral or other shaped grooves running in contrary directions, so that the turning of either or both shall cause the lubricating material in the groove or'grooves to be distributed over the whole of the bearing surfaces vand thus uniformly lubricate them.

My invention further consists in-arrauging, in connection with the pivot or step, anoil-receiver and passages, throughand by means of which the oil or other lubrieator may be supplied from the exterior to the interior working or bearing surfaces.

To enable others skilled in the art to make and use my invention, I will proceed to describe the same with reference to the drawing.

A represents the under part or portion of the step or pivot, and

B the'upper part or portion thereof.

A circular recess, u, is made in one part to receive a circular projection, b,'on the other part, so that they may turn truly one on or against the'other.

ln or on the bearing face of the part A is formed, by casting or otherwise, a spiral groove, c, running in .one direction from near its centerto near its perimeter; and in or on the other part B a similar groove, d, running in contrary direction, so that the grooves, when the step or .pivot is moved by the turning of the table, shall pass over each other with a shear Inove ment that carries the oil or other lubricator over almost the ent-ire frictioual or vbearing surfaces.

In the under part A of the step or pivot is a vertical well or-passage, e, which unit-es with a horizontal passage, f, extending across, or nearly so, this portion ofthe step or pivot, and at the diametric opposite end of the passage f there is a vertical passage, g, that leads up to the bearing surfaces of the two parts A B.

Through or in the upper portion B there is an opening, h, which may be closed with a screw-plug or cap, and which opening, when the parts are properly turned for that purpose, comes immediately over the well e, so that the lubricating material may be introduced into the passages in the under portion A, through and from the exterior of the upper portion and thence by means of the grooves c d throughout the bearing surfaces.

I have mentioned the grooves as being spiral. I

-prefer them of 'that general form, as they are easily made and serve the purpose well but I do notcoune myself to that precise form, because other forms of grooves may be made that will cross or pass each other with a shear4 or oblique motion, and carry and distribute the oil'throughout the bearing or friotional surfaces, which is thc'essence of my invention.

Branch openings or passages may be made from the passage f,so asto allow/the lubricating material to come tothe bearing surfaces at several points, o r

where they connect with the grooves.

Having thus fully described my invention,

l. A pivot or step for turn-tables, composed of an under and upper piece, with grooves in their bearing or working surfaces running in' contrary directions so as to distribute the oil or other lubricating compound in the grooves throughout the bearing surfaces, substantially as described and represented.

2. In combination with the two parts of thepivot or step and vtheir oilfgrooves passing each other in oblique lines, the oil-passage or passages It e f g, for

introducing the oil or other lubricato from the extelrior to the interior bearing surfaces, substautiallv as described. l

JOHN VW. MURPHY.'

Witnesses:

- JOHN DYER,

FRANK WM. Gu'frz. 

